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1de7b4b805
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. No functional change intended.
416 lines
9.4 KiB
C
416 lines
9.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-4-Clause
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*
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* Copyright (c) 1993 Paul Kranenburg
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Paul Kranenburg.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/wait.h>
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#include <machine/elf.h>
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#include <arpa/inet.h>
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#include <dlfcn.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "extern.h"
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/* We don't support a.out executables on arm64 and riscv */
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#if !defined(__aarch64__) && !defined(__riscv)
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#include <a.out.h>
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#define AOUT_SUPPORTED
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#endif
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/*
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* 32-bit ELF data structures can only be used if the system header[s] declare
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* them. There is no official macro for determining whether they are declared,
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* so check for the existence of one of the 32-macros defined in elf(5).
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*/
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#ifdef ELF32_R_TYPE
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#define ELF32_SUPPORTED
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#endif
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#define LDD_SETENV(name, value, overwrite) do { \
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setenv("LD_" name, value, overwrite); \
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setenv("LD_32_" name, value, overwrite); \
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} while (0)
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#define LDD_UNSETENV(name) do { \
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unsetenv("LD_" name); \
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unsetenv("LD_32_" name); \
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} while (0)
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static int is_executable(const char *fname, int fd, int *is_shlib,
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int *type);
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static void usage(void);
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#define TYPE_UNKNOWN 0
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#define TYPE_AOUT 1
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#define TYPE_ELF 2 /* Architecture default */
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#if __ELF_WORD_SIZE > 32 && defined(ELF32_SUPPORTED)
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#define TYPE_ELF32 3 /* Explicit 32 bits on architectures >32 bits */
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#define _PATH_LDD32 "/usr/bin/ldd32"
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static int
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execldd32(char *file, char *fmt1, char *fmt2, int aflag, int vflag)
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{
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char *argv[9];
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int i, rval, status;
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LDD_UNSETENV("TRACE_LOADED_OBJECTS");
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rval = 0;
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i = 0;
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argv[i++] = strdup(_PATH_LDD32);
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if (aflag)
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argv[i++] = strdup("-a");
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if (vflag)
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argv[i++] = strdup("-v");
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if (fmt1 != NULL) {
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argv[i++] = strdup("-f");
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argv[i++] = strdup(fmt1);
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}
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if (fmt2 != NULL) {
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argv[i++] = strdup("-f");
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argv[i++] = strdup(fmt2);
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}
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argv[i++] = strdup(file);
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argv[i++] = NULL;
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switch (fork()) {
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case -1:
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err(1, "fork");
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break;
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case 0:
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execv(_PATH_LDD32, argv);
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warn("%s", _PATH_LDD32);
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_exit(127);
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break;
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default:
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if (wait(&status) < 0)
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rval = 1;
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else if (WIFSIGNALED(status))
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rval = 1;
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else if (WIFEXITED(status) && WEXITSTATUS(status) != 0)
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rval = 1;
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break;
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}
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while (i--)
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free(argv[i]);
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LDD_SETENV("TRACE_LOADED_OBJECTS", "yes", 1);
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return (rval);
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}
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#endif
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int
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main(int argc, char *argv[])
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{
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char *fmt1, *fmt2;
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int rval, c, aflag, vflag;
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aflag = vflag = 0;
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fmt1 = fmt2 = NULL;
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while ((c = getopt(argc, argv, "af:v")) != -1) {
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switch (c) {
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case 'a':
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aflag++;
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break;
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case 'f':
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if (fmt1 != NULL) {
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if (fmt2 != NULL)
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errx(1, "too many formats");
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fmt2 = optarg;
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} else
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fmt1 = optarg;
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break;
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case 'v':
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vflag++;
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break;
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default:
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usage();
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/* NOTREACHED */
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}
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}
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argc -= optind;
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argv += optind;
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if (vflag && fmt1 != NULL)
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errx(1, "-v may not be used with -f");
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if (argc <= 0) {
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usage();
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/* NOTREACHED */
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}
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#ifdef __i386__
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if (vflag) {
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for (c = 0; c < argc; c++)
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dump_file(argv[c]);
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exit(error_count == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
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}
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#endif
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rval = 0;
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for (; argc > 0; argc--, argv++) {
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int fd, status, is_shlib, rv, type;
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if ((fd = open(*argv, O_RDONLY, 0)) < 0) {
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warn("%s", *argv);
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rval |= 1;
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continue;
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}
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rv = is_executable(*argv, fd, &is_shlib, &type);
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close(fd);
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if (rv == 0) {
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rval |= 1;
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continue;
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}
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switch (type) {
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case TYPE_ELF:
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case TYPE_AOUT:
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break;
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#if __ELF_WORD_SIZE > 32 && defined(ELF32_SUPPORTED)
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case TYPE_ELF32:
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rval |= execldd32(*argv, fmt1, fmt2, aflag, vflag);
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continue;
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#endif
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case TYPE_UNKNOWN:
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default:
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/*
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* This shouldn't happen unless is_executable()
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* is broken.
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*/
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errx(EDOOFUS, "unknown executable type");
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}
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/* ld.so magic */
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LDD_SETENV("TRACE_LOADED_OBJECTS", "yes", 1);
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if (fmt1 != NULL)
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LDD_SETENV("TRACE_LOADED_OBJECTS_FMT1", fmt1, 1);
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if (fmt2 != NULL)
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LDD_SETENV("TRACE_LOADED_OBJECTS_FMT2", fmt2, 1);
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LDD_SETENV("TRACE_LOADED_OBJECTS_PROGNAME", *argv, 1);
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if (aflag)
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LDD_SETENV("TRACE_LOADED_OBJECTS_ALL", "1", 1);
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else if (fmt1 == NULL && fmt2 == NULL)
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/* Default formats */
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printf("%s:\n", *argv);
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fflush(stdout);
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switch (fork()) {
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case -1:
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err(1, "fork");
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break;
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default:
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if (wait(&status) < 0) {
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warn("wait");
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rval |= 1;
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} else if (WIFSIGNALED(status)) {
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fprintf(stderr, "%s: signal %d\n", *argv,
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WTERMSIG(status));
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rval |= 1;
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} else if (WIFEXITED(status) &&
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WEXITSTATUS(status) != 0) {
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fprintf(stderr, "%s: exit status %d\n", *argv,
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WEXITSTATUS(status));
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rval |= 1;
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}
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break;
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case 0:
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if (is_shlib == 0) {
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execl(*argv, *argv, (char *)NULL);
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warn("%s", *argv);
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} else {
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dlopen(*argv, RTLD_TRACE);
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warnx("%s: %s", *argv, dlerror());
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}
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_exit(1);
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}
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}
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return rval;
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}
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static void
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usage(void)
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{
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fprintf(stderr, "usage: ldd [-a] [-v] [-f format] program ...\n");
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exit(1);
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}
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static int
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is_executable(const char *fname, int fd, int *is_shlib, int *type)
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{
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union {
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#ifdef AOUT_SUPPORTED
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struct exec aout;
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#endif
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#if __ELF_WORD_SIZE > 32 && defined(ELF32_SUPPORTED)
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Elf32_Ehdr elf32;
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#endif
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Elf_Ehdr elf;
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} hdr;
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int n;
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*is_shlib = 0;
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*type = TYPE_UNKNOWN;
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if ((n = read(fd, &hdr, sizeof(hdr))) == -1) {
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warn("%s: can't read program header", fname);
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return (0);
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}
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#ifdef AOUT_SUPPORTED
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if ((size_t)n >= sizeof(hdr.aout) && !N_BADMAG(hdr.aout)) {
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/* a.out file */
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if ((N_GETFLAG(hdr.aout) & EX_DPMASK) != EX_DYNAMIC
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#if 1 /* Compatibility */
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|| hdr.aout.a_entry < __LDPGSZ
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#endif
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) {
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warnx("%s: not a dynamic executable", fname);
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return (0);
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}
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*type = TYPE_AOUT;
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return (1);
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}
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#endif
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#if __ELF_WORD_SIZE > 32 && defined(ELF32_SUPPORTED)
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if ((size_t)n >= sizeof(hdr.elf32) && IS_ELF(hdr.elf32) &&
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hdr.elf32.e_ident[EI_CLASS] == ELFCLASS32) {
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/* Handle 32 bit ELF objects */
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Elf32_Phdr phdr;
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int dynamic, i;
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dynamic = 0;
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*type = TYPE_ELF32;
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if (lseek(fd, hdr.elf32.e_phoff, SEEK_SET) == -1) {
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warnx("%s: header too short", fname);
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return (0);
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}
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for (i = 0; i < hdr.elf32.e_phnum; i++) {
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if (read(fd, &phdr, hdr.elf32.e_phentsize) !=
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sizeof(phdr)) {
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warnx("%s: can't read program header", fname);
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return (0);
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}
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if (phdr.p_type == PT_DYNAMIC) {
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dynamic = 1;
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break;
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}
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}
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if (!dynamic) {
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warnx("%s: not a dynamic ELF executable", fname);
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return (0);
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}
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if (hdr.elf32.e_type == ET_DYN) {
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if (hdr.elf32.e_ident[EI_OSABI] == ELFOSABI_FREEBSD) {
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*is_shlib = 1;
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return (1);
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}
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warnx("%s: not a FreeBSD ELF shared object", fname);
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return (0);
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}
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return (1);
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}
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#endif
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if ((size_t)n >= sizeof(hdr.elf) && IS_ELF(hdr.elf) &&
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hdr.elf.e_ident[EI_CLASS] == ELF_TARG_CLASS) {
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/* Handle default ELF objects on this architecture */
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Elf_Phdr phdr;
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int dynamic, i;
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dynamic = 0;
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*type = TYPE_ELF;
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if (lseek(fd, hdr.elf.e_phoff, SEEK_SET) == -1) {
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warnx("%s: header too short", fname);
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return (0);
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}
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for (i = 0; i < hdr.elf.e_phnum; i++) {
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if (read(fd, &phdr, hdr.elf.e_phentsize)
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!= sizeof(phdr)) {
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warnx("%s: can't read program header", fname);
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return (0);
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}
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if (phdr.p_type == PT_DYNAMIC) {
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dynamic = 1;
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break;
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}
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}
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if (!dynamic) {
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warnx("%s: not a dynamic ELF executable", fname);
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return (0);
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}
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if (hdr.elf.e_type == ET_DYN) {
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switch (hdr.elf.e_ident[EI_OSABI]) {
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case ELFOSABI_FREEBSD:
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*is_shlib = 1;
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return (1);
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#ifdef __ARM_EABI__
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case ELFOSABI_NONE:
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if (hdr.elf.e_machine != EM_ARM)
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break;
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if (EF_ARM_EABI_VERSION(hdr.elf.e_flags) <
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EF_ARM_EABI_FREEBSD_MIN)
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break;
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*is_shlib = 1;
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return (1);
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#endif
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}
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warnx("%s: not a FreeBSD ELF shared object", fname);
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return (0);
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}
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return (1);
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}
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warnx("%s: not a dynamic executable", fname);
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return (0);
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}
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